A fellowship involving clinical research would be a better investment in my opinion or just getting the experience where you get this sort of training on the job. Fellowships typically pay a low salary but so would a clinical trial assistant/clinical trial coordinator job. There are also entry-level CRA jobs at big companies like quintiles, PPD, etc...that comprehensively train you in all the things these courses offer you. Unfortunately that is a saturated market as well, where you are competing against people from healthcare and non-healthcare background alike and so these entry level positions come up very rarely. An alternative would be to get into oncology as a pharmacist - since that is a booming research market and networking to leverage that experience within clinical research positions.
If you can afford to get the knowledge with these certifications, do it. But based on my personal research in the area - people with a whole lot less education are able to obtain the knowledge these certification courses offer on the job and go up the career ladder with time.
